package com.example.rbac.controller;

import com.google.code.kaptcha.impl.DefaultKaptcha;
import io.swagger.annotations.ApiOperation;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.awt.image.BufferedImage;
import java.io.IOException;

/**
 * 验证码
 */
//@Api(tags = "CaptchaController")
@RestController
public class CaptchaController {

    @Autowired
    private DefaultKaptcha defaultKaptcha;

    @ApiOperation(value = "验证码")
    @GetMapping(value="/captcha", produces = "image/jpeg")
    public void captcha(HttpServletRequest request, HttpServletResponse response) throws IOException {
        //定义response输出类型为image/jpeg类型
        response.setDateHeader("Expires",0);
        //set standard HTTP/1.1 no cache headers
        response.setHeader("Cache-Control","no-store,no-cache,must-revalidate");
        //Set IE extended HTTP/1.1 no-cache headers(use addHeader)
        response.addHeader("Cache-Control","post-check=0,pre-check=0");
        //Set standard HTTP/1.0 no-cache header
        response.setHeader("Pragma","no-cache");
        //return a jpeg
        response.setContentType("image/jpeg");

        //生成验证码begin
        //获取验证码文本内容
        String text = defaultKaptcha.createText();
        System.out.println("text = " + text);
        //将验证码放入session中
        request.getSession().setAttribute("captcha",text);
        //根据文本内容创建图像验证码
        BufferedImage image = defaultKaptcha.createImage(text);
        ServletOutputStream outputStream = null;
       try{
            outputStream = response.getOutputStream();
           //输出流输出图片,格式为jpg
           ImageIO.write(image,"jpg",outputStream);
           outputStream.flush();
       } catch (Exception e){
           e.printStackTrace();
       } finally {
           if (outputStream != null){
               try {
                   outputStream.close();
               } catch (IOException e) {
                   e.printStackTrace();
               }
           }
       }

        //生成验证码end
    }
}
